Wrench



Jfily .29, 1930. SZIABO ET AL I 1,771,970

WRENCH Filed Dec. 50, 1927 INVENTORSI I *v M ATTORNEY Patented July 29, 1930 UNITED STATES LOUIS SZABO AND CARLOS MAGI-IATA, OF BUEN'OS AIRES, ,ARGENTINA WRENCH Application filed December 30, 1927. Serial No. 243,606.

Our invention relates to improvements in Wrenches, in which a socket for engaging the nuts or bolt heads is operated by a handle or lever. One object of the invention is to provide means whereby socket members designed to fit nuts or bolts of different sizes may be readily mounted in and removed from the head of the wrench, andanother object of the invention is to provide means whereby the operating handle may be automatically coupled to and uncoupled from the socket member during operation, said coupling means being silent during functioning.

In the accompanying drawing:

Figure 1 is a side elevation'of a wrench embodying the features of our invention;

Figure 2 is an enlarged plan view, partly in section, of the head portion of the wrench;

Figure 3 is a detail end view of the head;

Figure 4 is a cross section on the line aa-ac of Fig. 3.

Figure 5 is an elevation of the socket member;

Figure 6 is a crum pin.

The wrench comprises a lever or handle 1, having a sector 2 formed on one end which is pivotally connected by a pin 3 in a recess detail side view of the fulor cavity formed in the head member 4. Said pin is arranged eccentrically of the sector and the relative movement between the handle and head is limited by shoulders 5 extending laterally of the sector and adapted to abut against one end of said head.

The head 4 has a cylindrical opening 6, the axis of which is perpendicular to the axis of the handle and in said opening is rotatably and removably mounted a socket member 7, which has an hexagonal or other shape opening designed to receive and engage a nut, bolt or the like.

To retain the socket member 7 in the opening 6, a peripheral annular flange 8 formed on one end of said member is adapted to abut against one side of. the head; the other end of said member, which projects beyond the opening 6, is formed with a peripheral annular groove 10, Fig. 5, and a short diagonal groove 11 which extends from the groove 10 to the end of the socket forming a sort of screw-thread.- The fulcrum pin 3, Fig, 6; has an arm 9 extending at right angles therefrom,

and the end of said arm is adapted to be i brought into engagementjwith the groove 10 by first passing the end of said arm along the diagonal groove 11' by rotating the socket. With the arm 9 engaging the groove 10 axial movement of the socket 7 in the head is provented.

From the above description it will be readily understood that due to the eccentric position of the pin 3, movement of the handle 1 in one direction i. e. downward from the position shown in Fig. 2 will cause a binding action of the sector 2 on the periphery of the socket, so that the socket head and handle move together. Movement of the handle in the opposite direction swings the sector out of contact with the socket so that the latter does not move with the handle.

The socket member 7 may be easily and quickly removed, for the purpose of substituting sockets adapted for nuts, bolts and drill bits of different sizes and forms. i

The noise incident to wrenches employing a pawl is eliminated by the use of the sector; a smaller relative movement between the bead and socket is possible, and an equally positive coupling between thehandle and socket without the risk of rupture is obtained.

It will be understood that modifications of details may be introduced without departing from the invention.

We claim A wrench comprising a head portion having a cylindrical opening and a recess extending at right angles to the axis of said opening, a socket member rotatable in the opening and having an annular groove formed in its outer periphery at one end thereof, a lever mounted in the recess adapted to engage the socket and an eccentrically arranged pin forming a fulcrum for the lever and having an extension projecting into said groove to hold the socket against longitudinal movement in the head, said socket member having a diagonal groove therein extending from the annular groove to the end of the socket to permit the passage of said extension into and out of the annular groove.

LOUIS SZABQ.

CARLOS MACHATA. 

